Spunbond nonwoven fabrics from reclaimed polymer

ABSTRACT

A spunbond nonwoven fabric useful as a topsheet is produced from polypropylene filaments including a high level of reclaimed polypropylene, while maintaining a product quality, including superior formation, comparable to that obtained when using 100 percent virgin polymer. The spunbond nonwoven fabric is made with multicomponent filaments having at least two different polymer components occupying different areas within the filament cross section, and wherein one of the polymer components comprises reclaimed polypropylene recovered from previously spun polypropylene fiber or webs comprised of previously spun polypropylene fiber. In a specific embodiment, the filaments are sheath-core bicomponent filaments and the reclaimed polypropylene is present in the core component. The core of the bicomponent filament can be comprised of up to 100% reclaimed polypropylene.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This is a divisional of Application Ser. No. 09/921,323, filedAug. 2, 2001.

FIELD OF THE INVENTION

[0002] This invention relates to improvements in the manufacture ofspunbonded nonwoven fabrics, and more particularly to the use ofrecycled polymer in the manufacture of spunbond nonwoven fabrics.

BACKGROUND OF THE INVENTION

[0003] A major goal in the nonwovens industry is to reduce cost. At thesame time there is growing concern in society about degradation of thenatural environment. Disposal of solid waste is a major contribution tothis growing environmental concern.

[0004] During the production of polypropylene nonwoven fabrics,significant waste polypropylene is generated during startup of theprocess, from trimming left when the nonwoven web is slit to customer'sspecification, and from rolls that may have been slightly damaged orotherwise out of specifications. This polypropylene waste, coming frompreviously spun polypropylene fiber and webs comprised of previouslyspun polypropylene fiber, can be safely sent to solid waste landfills.However since this is very clean polypropylene it can also be remeltedfor recycling back through the spunbonding process. Recycle thus meetstwo goals, saving of the cost of wasted polypropylene and reduced solidwaste to downgrade the natural environment.

[0005] Recycling such polypropylene is well known in the nonwovenindustry. However once the polypropylene goes through the spinningprocess it is partly degraded by oxidation so that the polymer molecularweight is reduced. This effect can be partly mitigated by the optimizedaddition of antioxidants. However some degradation is always seen. Suchdegradation can be seen by measuring the melt flow rate of the processedpolymer. The melt flow rate will increase. The melt flow ofpolypropylene can be measured as taught in ASTM D-1238, at conditions of230° C. and 2.14 kg.

[0006] Because of the reduced molecular weight, the recycledpolypropylene is not generally suitable for being used by itself in themanufacture of spunbond nonwoven fabrics. Therefore, it is typicallyblended with virgin polypropylene. However, the amount of recycledpreviously spun polypropylene that can be recycled is limited. If toomuch recycled polypropylene is blended with the virgin resin, then anincrease in the number of spinning breaks (broken filaments) will beseen. These broken filaments will cause quality defects in the finishedspunbond nonwoven fabric or, in severe cases, a complete disruption ofthe manufacturing process. Second, the presence of too much recycledpolypropylene can reduce the measured tensile strength of the resultingspunbond nonwoven fabric. For these reasons the amount of polypropylenerecycled back through the process is usually limited to less than about20% of the total polypropylene by weight.

SUMMARY OF THE INVENTION

[0007] The present invention makes it possible to use a high level ofreclaim, while maintaining a product quality, including superiorformation, comparable to that obtained when using 100 percent virginpolymer.

[0008] According to the present invention, a spunbond nonwoven fabric ismade with multicomponent filaments having at least two different polymercomponents occupying different areas within the filament cross section,and wherein one of the polymer components comprises reclaimedpolypropylene recovered from previously spun polypropylene fiber or webscomprised of previously spun polypropylene fiber. In a specificembodiment, the filaments are sheath-core bicomponent filaments and thereclaimed polypropylene is present in the core component. The core ofthe bicomponent filament can be comprised of up to 100% reclaimedpolypropylene.

[0009] For producing the spunbond nonwoven fabric, we have developed aparticular process which enables producing bicomponent filaments withhigh reclaimed polypropylene content and at the high speeds which arenecessary for practical and economical commercial production. Thespunbond nonwoven fabrics have superior formation and product quality.

[0010] According to the present invention, a process for producingspunbond nonwoven fabrics is provided, comprising the steps of:separately melting two or more polymeric components, at least onepolymeric component including reclaimed polypropylene recovered frompreviously spun polypropylene fiber or webs comprised of previously spunpolypropylene fiber; separately directing the two or more molten polymercomponents through a distribution plate configured so that the separatemolten polymer components combine at a multiplicity of spinneretteorifices to form filaments containing the two or more polymercomponents; extruding the multicomponent filaments from the spinneretteorifices into a quench chamber; directing quench air from a firstindependently controllable blower into the quench chamber and intocontact with the filaments to cool and solidify the filaments; directingthe filaments and the quench air into and through a filament attenuatorand pneumatically attenuating and stretching the filaments; directingthe filaments from the attenuator into and through a filament depositingunit; depositing the filaments from the depositing unit randomly upon amoving continuous air-permeable belt to form a nonwoven web ofsubstantially continuous filaments; applying suction from a secondindependently controllable blower beneath the air-permeable belt so asto draw air through the depositing unit and through the air-permeablebelt; and directing the web through a bonder and bonding the filamentsto convert the web into a coherent nonwoven fabric.

[0011] In a further, more specific, aspect, the present inventionprovides a process for producing a spunbond nonwoven fabric, comprisingthe steps of: reclaiming polypropylene from previously spunpolypropylene fiber or webs comprised of previously spun polypropylenefiber; separately melting a first polymeric component comprising virginpolypropylene and a second polymeric component comprising the reclaimedpolypropylene; separately directing the first and second molten polymercomponents through a distribution system configured so that the separatemolten polymer components combine at a multiplicity of spinneretteorifices to form bicomponent filaments containing a core of the secondpolymer component and a surrounding sheath of the first polymercomponent; extruding the bicomponent filaments from the spinneretteorifices into a quench chamber; directing quench air into the quenchchamber and into contact with the filaments to cool and solidify thefilaments; directing the filaments and the quench air into and through afilament attenuator and pneumatically attenuating and stretching thefilaments; directing the filaments from the attenuator into and througha filament depositing unit; depositing the filaments from the depositingunit randomly upon a moving continuous air-permeable belt to form anonwoven web of substantially continuous filaments; and directing theweb through a bonder and bonding the filaments to convert the web into acoherent nonwoven fabric.

[0012] The present invention also provides a spunbond nonwoven fabricproduced by the above-described processes.

[0013] In a further aspect, the present invention is directed to aspunbond nonwoven fabric which includes substantially continuousmulticomponent filaments having at least two different polymercomponents occupying different areas within the filament cross section,and wherein one of the polymer components comprises reclaimedpolypropylene recovered from previously spun polypropylene fiber or webscomprised of previously spun polypropylene fiber. The spunbond nonwovenfabric is suitable for being used as components in hygiene applications,such as diapers and incontinent garments. The nonwoven fabrics showsuperior formation, as indicated by a coefficient of variation for airpermeability of less than about 7 percent.

[0014] In a further specific embodiment, the spunbond nonwoven fabricincludes substantially continuous sheath/core bicomponent filaments, thesheath component comprising polypropylene, the core component comprisingreclaimed polypropylene having a melt flow rate at least 5 units higherthan the sheath component.

[0015] In a specific embodiment, the initial handling, melting, andforwarding of the two or more polymer components is carried out inrespective individual extruders. The separate polymer components arecombined and extruded as multicomponent filaments with the use of a spinbeam equipped with spin packs having a unique distribution platearrangement available from Hills, Inc. and described in U.S. Pat. Nos.5,162,074; 5,344,297 and 5,466,410. The extruded filaments are quenched,attenuated and deposited onto a moving air-permeable conveyor belt usinga system known as the Reicofil III system, as described in U.S. Pat. No.5,814,349. The web of filaments which is formed on the conveyor belt maybe bonded, either in this form or in combination with additional layersor components, by passing through a bonder. The bonder may comprise aheated calender having a patterned calender roll which forms discretepoint bonds throughout the fabric. Alternatively, the bonder maycomprise a through-air bonder. The fabric is then wound into roll formusing a commercially available take-up assembly

BRIEF DESCRIPTION OF THE DRAWING

[0016] The drawing FIGURE shows schematically an arrangement of systemcomponents for producing a bicomponent spunbonded nonwoven fabric inaccordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention now will be described more fullyhereinafter with reference to the accompanying drawing, in which apreferred embodiment of the invention is shown. This invention may,however, be embodied in many different forms and should not be construedas limited to the embodiment set forth herein; rather, this embodimentis provided so that this disclosure will be thorough and complete, andwill fully convey the scope of the invention to those skilled in theart. Like numbers refer to like elements throughout.

[0018] The drawing FIGURE schematically illustrates the systemcomponents for carrying out the process of the present invention. In theillustrated embodiment, the system includes two extruders 11, 12 adaptedfor receiving and processing two separate fiber-forming polymermaterials, typically received from the manufacturer in the form ofpolymer chip or flake. The extruders are equipped with inlet hoppers 13,14 adapted for receiving a supply of polymer material in granular orflake form. The extruders include a heated extruder barrel in which ismounted an extruder screw having convolutions or flights configured forconveying the chip or flake polymer material through a series of heatingzones while the polymer material is heated to a molten state and mixedby the extruder screw. Extruders of this type are commercially availablefrom various sources. Alternatively, one or both of the extruders can befed molten polymer from polypropylene obtained directly frompolypropylene filaments or webs. For example, the extruder which is usedfor supplying polymer for the core component of a sheath/corebicomponent filament (e.g. extruder 12 in the drawing) can be equippedwith an additional auxiliary feed extruder (not shown) which directlyreceives polypropylene webs or filaments and melts the webs or filamentsin order to supply molten reclaimed polypropylene polymer to the barrelof the main extruder (e.g. extruder 12). The main extruder can beoperated with 100 percent reclaimed polypropylene from this auxiliaryfeed extruder, or the reclaimed polypropylene can be blended with virginpolypropylene resin supplied from hopper 14.

[0019] A spin beam assembly, generally indicated at 20, iscommunicatively connected to the discharge end of each extruder forreceiving molten polymer material therefrom. The spin beam assembly 20extends in the cross-machine direction of the apparatus and thus definesthe width of the nonwoven fabric to be manufactured. The spin beamassembly is typically several meters in length. Mounted to the spin beamassembly is one or more replaceable spin packs designed to receive themolten polymer material from the two extruders, to filter the polymermaterial, and then to direct the polymer material through finecapillaries formed in a spinnerette plate. The polymer is extruded fromthe capillary orifices under pressure to form fine continuous filaments.It is important to the present invention to provide a high density ofspinnerette orifices. Preferably the spinnerette should have a densityof at least 3000 orifices per meter of length of the spin beam, and moredesirably at least 4000 orifices per meter. Hole densities as high as6000 per meter are contemplated.

[0020] Each spin pack is assembled from a series of plates sandwichedtogether. At the downstream end or bottom of the spin pack is aspinnerette plate 22 having spinnerette orifices as described above. Atthe upstream end or top is a top plate having inlet ports for receivingthe separate streams of molten polymer. Beneath the top plate is ascreen support plate for holding filter screens that filter the moltenpolymer. Beneath the screen support plate is a metering plate havingflow distribution apertures formed therein arranged for distributing theseparate molten polymer streams. Mounted beneath the metering plate anddirectly above the spinnerette plate 22 is a distribution plate 24 whichforms channels for separately conveying the respective molten polymermaterials received from the flow distribution apertures in the meteringplate above. The channels in the distribution plate are configured toact as pathways for the respective separate molten polymer streams todirect the polymer streams to the appropriate spinnerette inletlocations so that the separate molten polymer components combine at theentrance end of the spinnerette orifice to produce a desired geometricpattern within the filament cross section. As the molten polymermaterial is extruded from the spinnerette orifices, the separate polymercomponents occupy distinct areas or zones of the filament cross section.For example, the patterns can be sheath/core, side-by-side, segmentedpie, islands-in-the-sea, tipped profile, checkerboard, orange peel, etc.The spinnerette orifices can be either of a round cross section or of avariety of cross sections such as trilobal, quadralobal, pentalobal, dogbone shaped, delta shaped, etc. for producing filaments of various crosssection.

[0021] The thin distributor plates 24 are easily manufactured,especially by etching, which is less costly than traditional machiningmethods. Because the plates are thin, they conduct heat well and holdvery low polymer volume, thereby reducing residence time in the spinpack assembly significantly. This is especially advantageous whenextruding polymeric materials which differ significantly in meltingpoints, where the spin pack and spin beam must be operated attemperatures above the melting point of the higher melting polymer. Theother (lower melting) polymer material in the pack experiences thesehigher temperatures, but at a reduced residence time, thus aiding inreducing degradation of the polymer material. Spin packs usingdistributor plates of the type described for producing bicomponent ormulti-component fibers are manufactured by Hills Inc. of W. MelborueFla., and are described in U.S. Pat. Nos. 5,162,074, 5,344,297 and5,466,410, the disclosures of which are incorporated herein byreference.

[0022] Upon leaving the spinnerette plate, the freshly extruded moltenfilaments are directed downwardly through a quench chamber 30. Air froman independently controlled blower 31 is directed into the quenchchamber and into contact with the filaments in order to cool andsolidify the filaments. As the filaments continue to move downwardly,they enter into a filament attenuator 32. As the filaments and quenchair pass through the attenuator, the cross sectional configuration ofthe attenuator causes the quench air from the quench chamber to beaccelerated as it passes downwardly through the attenuation chamber. Thefilaments, which are entrained in the accelerating air, are alsoaccelerated and the filaments are thereby attenuated (stretched) as theypass through the attenuator. The blower speed, attenuator channel gapand convergence geometry are adjustable for process flexibility.

[0023] Mounted beneath the filament attenuator 32 is afilament-depositing unit 34 which is designed to randomly distribute thefilaments as they are laid down upon an underlying moving endlessair-permeable belt 40 to form an unbonded web of randomly arrangedfilaments. The filament-depositing unit 34 consists of a diffuser withdiverging geometry and adjustable side walls. Beneath the air-permeablebelt 40 is a suction unit 42 which draws air downwardly through thefilament-depositing unit 34 and assists in the lay-down of the filamentson the air-permeable belt 40. An air gap 36 is provided between thelower end of the attenuator 32 and the upper end of the filamentdepositing unit 34 to admit ambient air into the depositing unit. Thisserves to facilitate obtaining a consistent but random filamentdistribution in the depositing unit so that the nonwoven fabric has gooduniformity in both the machine direction and the cross-machinedirection.

[0024] The quench chamber, filament attenuator and filament-depositingunit are available commercially from Reifenhauser GmbH & CompanyMachinenfabrik of Troisdorf, Germany. This system is described morefully in U.S. Pat. No. 5,814,349, the disclosure of which isincorporated herein by reference. This system is sold commercially byReifenhauser as the “Reicofil III” system.

[0025] The web of filaments on the continuous endless moving belt may besubsequently directed through a bonder and bonded to form a coherentnonwoven fabric. Bonding may be carried out by any of a number knowntechniques such as by passing through the nip of a pair of heatedcalender rolls 44 or a through-air bonder. Alternatively, the web offilaments may be combined with one or more additional components andbonded to form a composite nonwoven fabric. Such additional componentsmay include, for example, films, meltblown webs, or additional webs ofcontinuous filaments or staple fibers.

[0026] The polymer components for multicomponent filaments are selectedin proportions and to have melting points, crystallization properties,electrical properties, viscosities, and miscibilities that will enablethe multicomponent filament to be melt-spun and will impart the desiredproperties to the nonwoven fabric. At least one of the component isformed from reclaimed polypropylene recovered from previously spunpolypropylene fiber or webs comprised of previously spun polypropylenefiber. The reclaimed polypropylene will have been subjected to at leasttwo heat histories in which the polypropylene has been melted andresolidified: once when the virgin polypropylene resin (in pellet orflake from as received from the polymer manufacturer) was originallymelted and extruded to form the original filaments and webs, and atleast once again when the reclaimed polypropylene was remelted andformed into the filaments and webs of the present invention. In manyinstances, the polypropylene will have undergone an additional meltingand resolidification when the waste polypropylene, in the form of thefilaments or webs which are being reclaimed, is remelted and formed intopellets or flake suitable for processing in the extruders of thespunbond equipment. As a result of the prior heat histories, thereclaimed polypropylene exhibits a melt flow rate higher than that ofvirgin polypropylene, typically at least 5 melt flow units greater.

[0027] In one preferred embodiment, the multicomponent filaments aresheath-core bicomponent filaments, and the component containing thereclaimed polypropylene is present in the core of the sheath-corefilament. This component can contain up to 100 percent by weight of thereclaimed polypropylene, thus making it possible to significantlyincrease the amount of reclaimed polypropylene incorporated into thefilament. The sheath can contain 100 percent by weight virginpolypropylene resin, or blends of virgin polypropylene resin with asmaller amount of the reclaimed polypropylene than is present in thecore. Because of the higher content of reclaimed polypropylene, the corecomponent will have a melt flow rate higher than that of the sheath,typically at least 5 melt flow units greater than the sheath.

[0028] Preferably, the core component of the bicomponent filament willcomprise from 25% to 75% of the filament by weight, and more desirablyfrom 40% to 60% by weight of the filament. In such event, the reclaimedpolypropylene will comprise 25 percent or more of the total filament, byweight.

[0029] By incorporating the reclaimed polypropylene in the core of thefilament and surrounding it with a sheath of virgin polypropylene or ablend of virgin with reclaimed polypropylene, the spinning behavior ofthe filaments is comparable to that of monocomponent filaments formedentirely of the sheath composition. The process may be operated atspeeds comparable to what is used in the normal production of a spunbondfabric formed of monocomponent filaments, and the operating efficiencyand incidence of filament breaks is comparable. Also, the fabricphysical properties and formation remain comparable to fabrics formed ofconventional monocomponent filaments of virgin polymer. The nonwovenfabrics show superior formation, as indicated by a coefficient ofvariation for air permeability of less than about 7 percent.

[0030] Formation quality is a major concern for nonwoven fabrics used ascomponents in baby diapers or adult incontinent diapers or briefs. Goodformation allows manufacture to proceed at high speed without concern,for example, of adhesive bleeding through one layer of nonwoven fabricinto another part of the diaper. One measure of formation is the ratioof the standard deviation of air permeability divided by the average ofthe air permeability, multiplied by 100 percent. This ratio is sometimescalled the coefficient of variation. A nonwoven fabric showing a lowcoefficient of variation for air permeability will show a uniformdistribution of the fibers in the web making up the nonwoven. A nonwovenfabric showing a poor distribution of fibers in the web would show ahigher value for the coefficient of variation of the air permeability.

[0031] The spunbond fabrics of the present invention may be producedentirely of multicomponent or bicomponent filaments, or may be formedwith a blend of reclaim-containing multicomponent or bicomponentfilaments and conventional monocomponent filaments.

[0032] The following examples are provided to illustrate the presentinvention.

EXAMPLE 1 Control

[0033] A spunbond machine was employed equipped with three successivelyarranged spinning beams (identified A, B and C), each spinning beamhaving an independent polymer distribution system and equipped withspinnerettes capable of producing sheath-core bicomponent filaments. Ineach of beams A, B and C the polymer component that formed the sheath ofthe bicomponent filament and the polymer component that formed the coreof the bicomponent filament was comprised of virgin polypropylene resin(EXXON Resin PP 3155) so that the resulting filaments were comprised of100% virgin polypropylene. The polymer feed rate to beams A, B and C wassuch that the beams produced a web of 0.40 ounces per square yard (13.8grams per square meter) overall basis weight. The resulting web, whichis not part of our invention, was composed of 100% virgin polypropylenepolymer. The web was calender bonded with a patterned calender rollhaving 210 embossing points per square inch and having a 25% bond area.The fabric was then treated with surfactant to make the fabric fit foruse as topsheet for adult incontinence diapers. The fabric was submittedto physical testing and the results are given in Table 1.

[0034] For the data given in Table 1, basis weight was measuredgenerally following the method of ASTM D3776-96. MD and CD Tensileelongation, and toughness or TEA were measured generally following ASTMD5035-95 for testing 1-inch wide strips of nonwoven. The liquidtransport properties of the fabric, important for fabrics used astopsheet for baby diapers or adult incontinent diapers or briefs, wereevaluated using strike-through and rewet tests. Strike-through andrewet, or surface rewet, were evaluated by methods similar to thosedescribed in U.S. Pat. Nos. 4,041,951 and 4,391,869, incorporated hereinby reference. Strike-through was measured as the time for 5 ml of asynthetic urine solution, placed in the cavity of the strike-throughplate, to pass through the sample fabric into an absorbent pad. Surfacerewet, reported in grams, was evaluated by adding synthetic urinethrough the sample fabric into the absorbent pad until the absorbent padwas nearly saturated. Thus, the sample was wet at the beginning of thetest. A loading factor of approximately 4 grams of synthetic urine pergram of absorbent sample was used. a uniform pressure loading of 0.5 psiwas then applied and the procedure was concluded as described in theabove patents. Rewet in grams measures the weight of liquid that istransferred back through the topsheet from the core to a sheet of filterpaper facing the topsheet when compressed under the 0.5 psi loading. TheHunter color of the fabric was measured generally following ASTM E-308to yield an “L” value related to the lightness reflected off thesurface, an “a” value related to redness (+) or greenness (−) reflectedoff the sheet and a “b” value related to yellowness (+) or blueness (−)reflected off the sheet. Formation is a measure of the uniformity of thefiber distribution through the web of the bonded nonwoven fabric. Askilled tester visually compared control samples (standards) ofnonwovens exhibiting different degrees of fiber distribution uniformitywith the fabric to be evaluated. A score was given between 5 for verygood formation to 1 for very poor formation. Air permeability wasmeasured generally according to ASTM D-737. Air permeability is the rateof airflow through a material under a pressure differential between thetwo fabric surfaces.

EXAMPLE 2 15% Reclaim Control

[0035] The spunbond machine described in Example 1 was used to produce aspunbond nonwoven fabric of approximately 0.4 ounce per square yard(13.8 grams per square meter) overall basis weight. In beams A and C thepolymer component that became the sheath of the bicomponent filament wascomprised of virgin polypropylene resin (EXXON PP 3511). In beam A and Cthe polymer component that became the core of the bicomponent filamentwas also comprised of virgin polypropylene resin (EXXON PP 3155). Beam Bwas supplied with a homogeneous blend of 85% virgin polypropylene (ExxonPP 3155) and 15% reclaimed polypropylene recovered from previously spunpolypropylene fiber or webs comprised of previously spun polypropylenefiber. This polymer was supplied to both the sheath and the core of theresulting spun filaments. The resulting web, not part of our invention,was bonded as in Example 1 and was tested to obtain the data provided inTable 1 labeled Example 2.

EXAMPLE 3 Bicomponent With 100% Reclaim in Core

[0036] The spunbond machine described in Example 1 was used to produce aspunbond nonwoven web of 0.4 ounce per square yard (13.9 gram per squaremeter) overall basis weight containing reclaimed polypropylene. In beamA and B the polymer component that became the sheath of the bicomponentfilament was comprised of virgin polypropylene resin (EXXON PP 3155). Inbeam A and B the polymer component that became the core of thebicomponent filament was comprised of 100% reclaimed polypropylenerecovered from previously spun polypropylene fibers or webs comprised ofpreviously spun polypropylene fiber. Beam C was operated with virginpolypropylene resin (Exxon PP 3155) supplied to both the sheath and coreportion, so that the resulting filaments were comprised of 100% virginpolypropylene. The resulting web, a product of our invention, afterbonding and surfactant treatment as in Example 1, was tested to supplythe data shown in Table 1 to compare with the control fabric of Example1 made under the same conditions but with 100% virgin polypropylene. Theresults summarized in Table 1 show that the web of Examples 1 and 3 aresimilar in critical properties. Thus, the product of Example 3 is fitfor use as topsheet in adult incontinent products.

EXAMPLE 4 Control

[0037] The product of Example 4 was made as described in Example 1 aboveusing 100% virgin polypropylene resin (Exxon PP 3155), except thatbonding was achieved using a calender roll comprising 144 embossingpoints per square inch and 18% bond area. The three beams cooperated toproduce approximately equal output to yield a final web basis weight of0.7 ounces per square yard (23 grams per square meter). The fabricproperties of Example 4 are summarized in Table 1. This product issupplied for use as topsheet in the manufacture of baby diapers.

EXAMPLE 5 15% Reclaim Control

[0038] The product of Example 5 was made as described in Example 2above, except that bonding was achieved using a calender roll having 144embossing points per square inch and 18% bond area. The three beamscooperated to produce approximately equal output to yield a final basisweight of 0.65 ounce per square yard (22.1 grams per square meter).Properties of the product of Example 5 are summarized in Table 1.

EXAMPLE 6 Bicomponent With 100% Reclaim in Core

[0039] Example 6, a product of our invention, was made as described inExample 3 above, except that bonding was achieved using a calender rollhaving 144 embossing points per square inch and 18% bond area. The threebeams cooperated to produce approximately equal output to yield a finalbasis weight of 0.65 ounce per square yard (22.1 grams per squaremeter). Properties of the product of Example 6 are summarized in Table1.

[0040] Many modifications and other embodiments of the invention willcome to mind to one skilled in the art to which this invention pertainshaving the benefit of the teachings presented in the foregoingdescriptions and the associated drawings. Therefore, it is to beunderstood that the invention is not to be limited to the specificembodiments disclosed and that modifications and other embodiments areintended to be included within the scope of the appended claims.Although specific terms are employed herein, they are used in a genericand descriptive sense only and not for purposes of limitation. TABLE IEXAMPLE-1 EXAMPLE-2 EXAMPLE-3 EXAMPLE-4 EXAMPLE-5 EXAMPLE-6 STD. STD.STD. STD. STD. STD. PRODUCT AVER. DEV AVER DEV. AVER DEV AVER DEV. AVERDEV. AVER DEV. BASIS WEIGHT (g/m²) 13.79 0.33 13.85 0.32 13.86 0.3122.98 0.41 22.13 0.46 21.95 0.58 STRIP TENSILE - MD (g/cm) 523 70 500 73490 64 749 86 735 80 608 69 STRIP ELONGATION - MD (%) 43 9 44 7 55 8 608 58 8 55.6 8 STRIP TEA TOUGHNESS - (cm-gm/cm²) 197 39 191 43 202 52 20766 297 63 248 52 MD STRIP TENSILE - CD (gm/cm) 238 45 247 66 275 61 49377 486 73 400 66 STRIP ELONGATION - CD (%) 46 8 47 10 56 10 58 11 60 957 9 STRIP TEA TOUGHNESS- (cm-gm/cm²) 98 25 105 32 118 38 198 52 198 46164 41 CD STRIKE THROUGH (seconds) 2.18 0.42 2.13 0.19 2.26 0.4 2.110.26 1.99 0.21 2.07 0.24 REWET (gm) 0.14 0.03 0.13 0.02 0.16 0.02 0.110.02 0.11 0.01 0.12 0.02 HUNTER COLOR - L 96.6 0.33 96.32 0.41 96.520.38 97.08 0.34 97.04 0.46 96.76 0.46 HUNTER COLOR - a −0.38 0.09 −0.270.05 −0.31 0.05 −0.39 0.11 −0.33 0.04 −0.48 0.34 HUNTER COLOR - b 0.520.08 1.04 0.28 0.95 0.15 0.46 0.22 0.88 0.2 1.02 0.26 FORMATION 3.660.48 3.17 0.4 3.1 0.3 3.98 0.2 3.95 0.25 3.99 0.08 AIR PERMEABILITY(f³/f²/min) 917 53 930 48 884 46 693 30 672 26 701 37 AIR PERMEABILITY5.8 5.2 5.2 4.3 3.9 5.3 COEFFICIENT OF VARIATION AIR PERMEABILITY88 >20 >20 152 >20 >20 NO. OF TESTS

That which is claimed:
 1. A spunbond nonwoven fabric which includessubstantially continuous multicomponent filaments having at least twodifferent polymer components occupying different areas within thefilament cross section, and wherein one of the polymer componentscomprises reclaimed polypropylene recovered from previously spunpolypropylene fiber or webs comprised of previously spun polypropylenefiber, the fabric exhibiting superior formation as indicated by acoefficient of variability for air permeability of less than about 7%.2. A fabric according to claim 1, wherein the reclaimed polypropylenecomprises at least 25 percent by weight of the filament.
 3. A fabricaccording to claim 1, wherein said one polymer component is formedentirely of said reclaimed polypropylene.
 4. A fabric according to claim1, wherein at least one of the other polymer components has a melt flowrate at least 5 units lower than that of the reclaimed polypropylene. 5.A fabric according to claim 1, wherein at least one of the othercomponents is formed entirely of virgin polypropylene.
 6. A fabricaccording to claim 1, wherein the multicomponent filaments aresheath/core bicomponent filaments, and the reclaimed polypropylene ispresent in the core component and the virgin polypropylene is present inthe sheath component.
 7. A spunbond nonwoven fabric which includessubstantially continuous bicomponent filaments, the bicomponentfilaments having two different polypropylene polymer components withinthe filament cross section arranged to form a core component and asheath component surrounding the core component, the sheath componentincluding virgin polypropylene, the core component including reclaimedpolypropylene recovered from previously spun polypropylene fiber or webscomprised of previously spun polypropylene fiber and having a melt flowrate at least 5 units greater than that of the sheath component, and thefabric exhibiting superior formation as indicated by a coefficient ofvariability for air permeability of less than about 7%.
 8. A fabricaccording to claim 7, wherein at least 25 percent by weight of thebicomponent filament is comprised of said reclaimed polypropylene.
 9. Afabric according to claim 7, wherein at least 50 percent by weight ofthe bicomponent filament is comprised of said reclaimed polypropylene.10. A fabric according to claim 7, wherein the core component is formedfrom 100% reclaimed polypropylene recovered from previously spunpolypropylene fiber or webs comprised of previously spun polypropylenefiber.
 11. A fabric according to claim 7, wherein the sheath componentis formed from a blend of virgin polypropylene with reclaimedpolypropylene recovered from previously spun polypropylene fiber or webscomprised of previously spun polypropylene fiber.
 12. A fabric accordingto claim 7, which additionally includes substantially continuousmonocomponent filaments.
 13. A fabric according to claim 7, wherein saidmonocomponent filaments include filaments formed entirely of virginpolypropylene.
 14. An adult incontinence garment comprising a fabricaccording to claim
 7. 15. A baby diaper comprising a fabric according toclaim
 7. 16. A spunbond nonwoven fabric according to claim 1 produced bya process comprising the steps of: separately melting two or morepolymeric components, at least one polymeric component includingreclaimed polypropylene recovered from previously spun polypropylenefiber or webs comprised of previously spun polypropylene fiber;separately directing the two or more molten polymer components through adistribution plate configured so that the separate molten polymercomponents combine at a multiplicity of spinnerette orifices to formfilaments containing the two or more polymer components; extruding themulticomponent filaments from the spinnerette orifices into a quenchchamber; directing quench air from a first independently controllableblower into the quench chamber and into contact with the filaments tocool and solidify the filaments; directing the filaments and the quenchair into and through a filament attenuator and pneumatically attenuatingand stretching the filaments; directing the filaments from theattenuator into and through a filament depositing unit; depositing thefilaments from the depositing unit randomly upon a moving continuousair-permeable belt to form a nonwoven web of substantially continuousfilaments; applying suction from a second independently controllableblower beneath the air-permeable belt so as to draw air through thedepositing unit and through the air-permeable belt; and directing theweb through a bonder and bonding the filaments to convert the web into acoherent nonwoven fabric.
 17. A spunbond nonwoven fabric according toclaim 1 produced by a process comprising the steps of: separatelymelting a first polymeric component comprising virgin polypropylene anda second polymeric component comprising reclaimed polypropylenerecovered from previously spun polypropylene fiber or webs comprised ofpreviously spun polypropylene fiber; separately directing the first andsecond molten polymer components through a distribution plate configuredso that the separate molten polymer components combine at a multiplicityof spinnerette orifices to form bicomponent filaments containing a coreof the second polymer component and a surrounding sheath of the firstpolymer component; extruding the bicomponent filaments from thespinnerette orifices into a quench chamber; directing quench air from afirst independently controllable blower into the quench chamber and intocontact with the filaments to cool and solidify the filaments; directingthe filaments and the quench air into and through a filament attenuatorand pneumatically attenuating and stretching the filaments; directingthe filaments from the attenuator into and through a filament depositingunit; depositing the filaments from the depositing unit randomly upon amoving continuous air-permeable belt to form a nonwoven web ofsubstantially continuous filaments; applying suction from a secondindependently controllable blower beneath the air-permeable belt so asto draw air through the depositing unit and through the air-permeablebelt; and directing the web through a bonder and bonding the filamentsto convert the web into a coherent nonwoven fabric.
 18. A spunbondnonwoven fabric produced by a process comprising the steps of:separately melting two or more polymeric components, at least onepolymeric component including reclaimed polypropylene recovered frompreviously spun polypropylene fiber or webs comprised of previously spunpolypropylene fiber; separately directing the two or more molten polymercomponents through a distribution plate configured so that the separatemolten polymer components combine at a multiplicity of spinneretteorifices to form filaments containing the two or more polymercomponents; extruding the multicomponent filaments from the spinneretteorifices into a quench chamber; directing quench air from a firstindependently controllable blower into the quench chamber and intocontact with the filaments to cool and solidify the filaments; directingthe filaments and the quench air into and through a filament attenuatorand pneumatically attenuating and stretching the filaments; directingthe filaments from the attenuator into and through a filament depositingunit; depositing the filaments from the depositing unit randomly upon amoving continuous air-permeable belt to form a nonwoven web ofsubstantially continuous filaments; applying suction from a secondindependently controllable blower beneath the air-permeable belt so asto draw air through the depositing unit and through the air-permeablebelt; and directing the web through a bonder and bonding the filamentsto convert the web into a coherent nonwoven fabric.